Use is
syntax (#4079)
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export default function(x: any): boolean {
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import { ObjectID } from 'mongodb';
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export default function(x: any): x is ObjectID {
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return x.hasOwnProperty('toHexString') || x.hasOwnProperty('_bsontype');
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return x.hasOwnProperty('toHexString') || x.hasOwnProperty('_bsontype');
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}
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}
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